Methylparaben-induced decrease in collagen production and viability of cultured human dermal fibroblasts

Area of Science:

• Dermatology
• Cosmetic Science
• Biochemistry

Background:

• Parabens are widely used in cosmetics, food, and pharmaceuticals due to their preservative properties.
• Emerging research indicates parabens can accumulate in the human body and cause adverse effects.
• Methylparaben (MP) is a prevalent paraben used in cosmetic formulations.

Purpose of the Study:

• To investigate the impact of methylparaben (MP) on human dermal fibroblasts.
• To evaluate the effect of MP on collagen production and skin integrity.
• To explore the mechanisms underlying MP's effects on skin cells.

Main Methods:

• Human dermal fibroblasts were treated with varying concentrations of MP (0.01%, 0.03%, 0.05%).
• Collagen biosynthesis, prolidase activity, and collagen types I, III, and VI expression (protein and mRNA) were assessed.
• Matrix metalloproteinase-2 (MMP-2) activity, tissue inhibitor of metalloproteinase-2 (TIMP-2) activity, cell survival, proliferation, and apoptosis markers (caspase-3, Bax, Bcl-2) were analyzed.

Main Results:

• MP caused a dose-dependent decrease in collagen biosynthesis and prolidase activity, reducing total collagen secretion.
• MP significantly reduced collagen type I (protein and mRNA) and collagen types III and VI (mRNA) expression.
• MP increased MMP-2 activity, decreased TIMP-2 activity, inhibited cell survival and proliferation, and induced apoptosis.

Conclusions:

• Methylparaben adversely affects human dermal fibroblasts, impairing collagen synthesis and promoting degradation.
• MP exhibits cytotoxic effects on skin cells, potentially leading to apoptosis.
• These findings highlight the detrimental impact of MP on skin structure and integrity.